calculate semivariogram values and perform kriging BY HAND for a simple dataset
Hi, This sounds rather like homework.
On Tue, Mar 19, 2013 at 11:00 AM, ToNoY <tan.afreebird at gmail.com> wrote:
Can anyone tell me how to calculate semivariogram values by hand for point C
And by hand? How is this an R question? If you have an R question, by all means ask here. If you have a homework question, please ask your professor or TA. If you have a general stats question, StackOverflow is a good choice. Sarah
and D considering the distance between point A and B? say I have the following data points: point A: 60 (X-cord), 50 (Y-cord), & 1.2 (Z) point B: 30 (X-cord), 20 (Y-cord), & 2.1 (Z) point C: 20 (X-cord), 50 (Y-cord), & ? (Z) point D: 60 (X-cord), 50 (Y-cord), & ? (Z) Now, say, the best fit for model for the semivariogram is given by a spherical model as: y(h) = C0 + C(1-e^(h/a)) where, C0 = nugget effect, h = distance, and a = range. How can I do ordinary kriging by hand to estimate the Z value at point C and D. Also, how much weight (w) should be given to ZA and ZB while estimating ZC (ZC=w1*ZA+w2*ZB) or ZD (ZD=w1*ZA+w2*ZB)? Thanks in advance.
-- Sarah Goslee http://www.functionaldiversity.org